Recently, album covers have been taking dives in quality. Helloween's CGI on "Gambling With the Devil" is god awful and dont even get me started on "Dance of Death". but some bands have high quality album covers on a constant basis. Maiden, Priest and to a degree, Slayer all have had pretty insane album covers over the course of their expansive careers. Bathory and Windir have really killer album art as well. what are your highlights and lowlights in terms of album art?

UPDATE: DAMNATED has brought to my attention that there is a thread talking about best album covers so from here (10/15/08), this thread is only regarding BAD album covers.